Flower pot tray unit



FIG. 1 is an isometric view showing the top and one of four like sides of a flower pot tray unit showing my new design;

FIG. 2 is an isometric view showing the bottom and another of the four like sides thereof; and,

FIG. 3 is a side elevational view thereof. 

The ornamental design for a flower pot tray unit, as shown and described. 